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Finding the Fourth Proportional to 407.16, 561.64 and 249.72

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Solution

The fourth proportional to 407.16, 561.64 and 249.72 is: 344.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.16 : 561.64 = 249.72 : x
  2. Step 2: Convert to fraction form
    407.16/561.64 = 249.72/x
  3. Step 3: Cross multiply
    407.16x = 561.64 × 249.72
  4. Step 4: Simplify right side
    407.16x = 140,252.74
  5. Step 5: Solve for x
    x = 140,252.74/407.16
  6. Step 6: Final answer
    x = 344.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.